hey all..
i'm also following the pdf download 'RoR - build your own web apps'.
When i type "ruby script/server" i get the following..

iMac:~/rubyonrails/shovell mdskinner$ ruby script/server
./script/../config/boot.rb:7:in `require': no such file to load -- ./script/../config/../vendor/rails/railties/lib/initializer (LoadError)
from ./script/../config/boot.rb:7
from script/server:2:in `require'
from script/server:2


anyone know why??..